Testing arrangement for telephone-exchange systems.



" H. P. CLAUSEN.

TESTING ARRANGEMENT FOR THERHONE EXCHANGE SYSTEMS.

APPLICATION FILED NOV. l 1916 1 ,246,548. Patented Nov. 13, 1917,

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f OOH-1 4 ln venfor: Henry F Clause/1 H.- P. CLAUSEN. TESTING ARRANGEMENT FOR TELEPHONE EXCHANGE SYSTEMS. APPLSCATION FILED NOV. I 19W.

1 46,548. Patented Nov. 13, 1917.

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H. P. CLAUSEN.

TESTING ARRANGEMENT FOR TELEPHONE EXCHANGE SYSTEMS APPLICATION FILED NOV. 1.191s.

1,246,548. Rimmed M113, 1917.

3 SHEETSSHEET 3.

in Fig, 1. The brushes 1, 2 and 3 are adapted tof-be stepped over the rows of contacts 4, 5and 6, and 7, 8 and 9, in response to the intermittent energization of the stepping magnet 13. The brushes of the automatic switch are adapted to be connected to a plurality of sending devices indicated at 14, 15 and 16. These impulse sending devices may be of any well-known character such as the ordinary finger wheel, and may be, and preferably are, automaticnllv operated. In the arrangement indicated, three cams are provided with suitable teeth, which cams are adapted to be power driven at different speeds, to produce pulses at the rate of 10 per second, cam 15 being adapted to produce pulses at the rate of 8 per second, and cam 16 to produce pulses at the rate of 12 per second.

In order to connect the impulse senders in succession in operative relation to the switch under test, a step-by-step sequence or side switch is provided, the magnet of which is indicated at 17. that each time the ma net 17 is energized a cam shaft controlled thereby, is moved through a single step or position, which in each position, opens or c oses certain contact springs which are indicated on the drawing, the number of the position in which such contact springs are opened or closed being indicatedby the number adjacent to such'contact springs. A set of contacts of the connector switch to be tested, which are indicated at 18, 19 and 20, are connected in multiple with similar contacts of other switches to conductors leading to the testing arrangement. One of these conductors includes a relay indicated at-21 which corresponds to the ordinary cut-01f relay of a line, and theother two conductors are connected to'suitable apparatus associated with the testing arrangement which will 'be described more in detail in describing the operation of such testing arrangement:

In general, in performing a test, the testing arrangement is brought into association with the connector switch by means ofthe automatic switch whose stepping magnet'is indicated int 13." The testing arran ement thereupon operates to determine if t a connector .is'busy or idle. If the connector is idle, it isseized and-through the instrumentality of one of the impulse senders, a series of impulses is sent to the connector switch to' cause it to move its'brushes into contact with the set of terminals leading back to the testin arrangement." If this connection is estab ished within a predetermined time, the testing arrangement will operate to set. up 'anot er connection at n The operation a the testing-,a'rran ement, assuming first that the connector .15 busy, will now be described.

cam No. 14 being driven at a speed The arrangement is such imam . It will be assumed tha, the set of brushes 1, 2 and 8 has been broug tinto contact with the contacts 4 5 and 6, and that the manual switch indicated at 22 has been closed. the switch shown at Fig. 1 is busy, the relay 23 will have been operated and the ground wilt be thereby placed upon the contact 6. Under these conditions a circuit will be established from battery 24, throu h the lower arm of the manual switch 22, t rough sequence switch contact 25 in position 1, back contact and. outer left-hand armature of relay 28, rela -14,.back contact and left-hand armature o relay 26, to ground. Relay 14 will thereupon be energized, and in attracting its armatures will connect the brushes 1, 2 and 3 to the sequence switch springs 27 and 29. 'As'soon as relay 14 is operated a circuit is established for the relay 26 from battery 24, lower armature of the manual switch 22, sequence switch 25 inposition 1, relay 26, sequence switch spring 27 in position 1, armaturenind front contact of rela 14, brush 3, contact 6 to ground at the le t armature and contact of relay 23. Relay 26 thereupon operates and opens the circuit previously traced for the'relay 14, at the step such s uence switch from osition to position unti when position 13 is reached, a circuit is closed for the stepping magnet 13 of the automatic switch which may be traced from battery 24 to the lower arm of themanual switch 22, sequence switch-spring 25 in position 13, steppin magnet "13 to, ground. In response to-t e-energization of the stepping mi'ignet 13, the brushes of the switch are ddvanced to anoth-er row of-c on tacts,

Under control of interrupter 31 and sequence-switch contact 32,1110 at 17 is encrgized and the sequence switc contacts are moved into their firstpositions where the testis eatcd for another coiincctor'switch.

n-is I It'wil nowbeassumcd that, the switch showninFig. '1 isidlc. Therefore, as soon as thebrnshes 1, sand-am brought into contact I with the row of terminals 4, 5' and 6,

the manual switch 22 being closed, acircuit will he established as before for the-mii-gnet I 14, which magnet in operating will rnnnoct the brushes to the scrplence switch contacts 27 arid 29. In position 1 of the sequence switch, the rela oontect' fi toitheconrluctorlZ. -As the jswitxih from battery 30, through the power magnet switch contact 32 in position'l seized eitherfby a calling nne or another-- 's\vitoh;-that is,

- interrupter 31, upper, arm

.battory,. through relay 2 -front contact of relay 37 m ground." The spring 27 to tie brush 3 and through the is idle, ronnd (we not operate. The -sequence swito f is stepped out.'of position 1 when the power magnet thereof ie energized over a, circuit however, at this time-thereis no 17, seque nce of the -1nanua switch? 22, to ,ground: When the 'se uence switch is thus 'stepped' cdntucts27 and 29 in conneotion with the conta'ctsl33 ant 1 34 alasov in position 2, connect the inipiilse sender 14 aoross'tho'brnshes of 1 and 2.- .As the impulse springs 35 and 36 are closed in-tho DOITIllllPOSltlOH ofth'e im' va-temegnet 60, n hwh in lfe'leasingiistepe side switch co'ntzolled' thereby into pd pnleesenrler; 14, the effect on the ooz'inector switch will he"iclent-ieu1 with that whieh takes place when such connector Switch is of relay-'38 and back eon'mct thereof to'lower winding ofrolay 37 end onnd. Relay 3'1 when; energized, closes-a. cireuit for the slow be traced from release relay-'23 which ma 7 V signature and by theteeth.

condl'lotor 12 end renrlers the'partioular 'qonnecter switeli under test busy, end gu'er'cls such oonnecton'switch a gluinst seizure" by fa; selector, or calling line.

enil able mec impnlse'whee] 14 m: eugaged'by the's ring 4.6, the circuit of the lme'relay 37 Wlll be interrupted the number of 'the 'linerelay will be-interru' ted five times, fOljlOWBd by a: long 3 make 0 the circuit andthen will he interrupted three -times.:

ltf will be nsisnmed also that the set oftermififth row of; the

may 38,: the elmr r'olcq hennfoperated, Lll 'i SQCOflCl'SlOW release reln 26 is connected throizgh the I on the connector 12, and therein 26;

Pr v

into position the 'tion of such line" .ielny 39 is again spring 34 in position '2, 'sey 27 in position-2, iarnm relay .14, brush 2, lcona: tact 5, condnotor 311, inner lower. arrn'uture 1' will be assurned thatthe im .ulser lelhasbee'n started/bylianism, not shown, and. es soonas the tgeihmuhuponthe plniphery oifche r r 43 will-energized in with fthe ,pr1-=- vatewmagnet' 60 ;through a I .Bide 8wibch -a lie- 116' neotion if t of times'represented It will be-notedthat each of, the impulse wheels is provided with first. fiveqfeeth h'hdizhejn three teeth, so that dur- -60 "Eng-the rotation of the wheel 14, the circuit brush of'the "connector switch 1 ing themmienient of the-kid the vertical switch, which circuit maybe tracedbatlery through the ielid'viitoharm:- position 1, vertical 'mf et 10,'-re1a might-hand armature eg fi ont contac re 13 23, armatu re "endback conteotof 1m ay' 87, m g 'und h ep et n Q'f-J, slowereleas'e relay 39 0mm ;a'i oireuit-of;

m gn t In fifth "l'e'rel of the conteot. benli. :Iniree'pq to the long closure of'this 'ci'rieuit o tlaw;

will release, thu'sbpeningtheqoirolii' of tion,2. l I r l The next, series of implile'siulso tently'onergize and deonergi :t" I, y 37 and" in responseto .the'fiist deener giza relay B75,gthe-rloweacting fio energized,- lIlgSG-K ties with the rotary magnet-42 .yqhi'o'h enere' gizing cirouit' -mey be traced 'fmmymwmy;

through side-Swith ar'xi1 41in :pogitio'n rotary magnet 42, outer endgleikhsnderrnum-sfi 'ture and a k qnt t f herela cge, elem:

t e-Q'se "are.- threeyin numhe rotir' magnet will be energized- -t imefsji' end. enee will step-the:- brlfih f, Jqf the-*1 switch, in. the thirdgeontact the "f fth In response togthe ener mienr;

ate

44 in position 2, through th the buoy line,- thus holdingpri a te mag'net l in an energized condition-and=-'preYentmm the third position., In'ni pasehssunfed,

however, as the contacts, upon :whieliltheioon-k neetor brlisheerest are connected to the 6.2:5

ing arrangement, no such hea y qqnditio; n" beffon'nd, so then-the may} '11 energizedfandih into pafition 8.5-,

on an smei wien rmh'er this;

jeverpcircmt wh be traced from battery throu h the relay 21, contact 20, test brush of t e connector switch ,-'Bide-switch army 44 in position 8, to ground. A circuit will also be closed .for the ringing relay indicated at 46 from battel-y, through the side-switch arm 41in position .8, back contact and ri ht-hand armature of the cut-off relay 46, re ay 45,,through the interrupter to ground. he intermittent operation of the relay 45, due to the interrupter, intermittently connects to the conductors leading to the testing arrange ment ringing current from a generator connected to the leads 46 and 47. The path of the ringing current may be traced from the enera'tor, through the conductor 46, the lbwer'armatur'e and front contact of relay 45,'brush and contact 19, armature and front-contact of relay 21, through the resistan'ce 61,-sequence' switch contact 62 in osition 2, through the condenser 48, relily 28,-lower armature and front contact 'oi relay 14, back the contact 18 and to the brush of the; 'in'ector switch, and upper armature andffront contact of relay 45 to the conductor 47, and thence to the In this circuit the reringing generator. sistance 61 is proportioned to represent the usual line resistance, 'and thc condenser 49, placedin parallel with the condenser 48 and relay 28, isproportioncd to re resent the usual line capacity, so that the ringing may take place under conditions which are met in signaling. ordinary lines. The relay 28 will be ener ized 'over this circuit. The en ergization o relay 28 opens the circuit pre viously traced-for the relay 14-, which in releasing, opens the ringing circuit previously traced through relay 28.

The relay 2 8 when operated, short circuits the condenser 48 atits right-hand armature, thereby providing an energizing circuit for the relay 38, from battery, u per winding of relay 38, left armature and Back contact "of thc'priyate' magnet f60, upper armature and back contact of relay 45, (when such relay 4 5 is deener i zed, due to theaetion ofthe interrupter), rushpfthe connector, contact 18, armature and front contactcf'reljay 14, relay 28 right hand armature 'an'd' contact of relay 28, contact springlfiil, position 2, resistance 61, contact 19, brush of connector, lower armature and "relay .38, to

front contact of relay 45, lower winding of ground. I

Although thiscircuit for relay 38 is estab-' lished at thev same time that the circuit for relay 14, is broken, the relay 38.op erates before the relay 14 is deenergizcd,and as soon as the relay '14 releasesthc relay 38 is released. The relay 38 is-therefore only momentarily energized, 'but i scnergized long enough to c'ausethc energization of relay 46, over a circuit which may be traced from battery, through relay 46, lower 'armature and contact of relay 88, side-switch arm 44 in position 3' to ground. The relay 46 when energized, closes at i tsleft armature. a substitute locking circuit for itself independent of the relay 38. The rela 46 when energized, also opens the circuit 0 relay '45,. and disconnects the ringing current.

The release of the relay 14 opens the circuit of the line rela 37 which in releasing 1 permits the slow re ease, relay 23 to release. It The release of this relay closes the circuit of the release-magnet 63 from battery, releasemagnet 63, contacts of the ofi-normal switch 50, back contact'and right armature of relay 23, lower contact and armature'of 8t relay 38 to ground, thus restoring the connection to normal. The relay'28 when energized, also closes at its inner left-hand armature a circuit for the power magnet 17 of the sequence switch from battery, to the power magnet 17, con tact spring 32 in pos tion 2, inner left-hand armature and contact of relay 28 to ground. The encrgization of the power inagnct'l'r' moves the sequence switch from position 2 and into position 3. In position 3, the original energizing circuit of relay 14 is again established, and the testin arrangement is again connected there y to the brushes 1, 2 and 3. If, in the meantime, the' 'tc connector is not completely restored or has] i been seized by another call, the relay 2-6 be energized as previously described. How: ever, it will be assumed that the connectd'r switch is still idle, in which case the relay 106 14 will remain energized and the sequence switch 17 will be moved into posit-1on4,- under the influence of interrupter 31 through contact spring 32 in position 8. It will be observed that in position 46f the sequence switch, the impulse wheel dicated M15 is connected in o erativarel tion with the connector switc and iii-f spouse to the operation of such impulse wheel, the connector switch will be operated identically as before described to extend the connection to the 'set of contacts indicatedjat 1s, 19 and 20, Testing and ringin willtake place before described and t e relay 28 will-again be energized, and among other thin Wi l' release the connector as preyiousy scribed. This action, of course, wil tak place onlyin case the connector switch 0 crates in a standard manner mresponse w the operation of the im lse "wheel-'15.

As soon as the relay 8 is energized a cuit is established for the sequence; switch through contact spring 32 in" ositlon 4, to. drive itinto position '5, inw ieh position; I the relays 14 and 26 are again connected in operative relation with the sequence switch in order to a. in determine whether th, connector is i e, in the manner-previe I 4 described. The sequence switch, is

' shown at the upper part 'of Fig. 8. As soon ciated with the testing arran'ement have been brought into contact wit 7 the set of terminals indicated at v 104, 105 and 106% terminal 104 being'connected by means 0 conductor 107 to one limb of the line indicated at 108, and the terminal 105 being connected by means of the conductor 109 to. the other branch 110 of the line, and the third terminal 106 bei connected by the conductortlll to the glunger magnet 112 of the line switch. As soon as the manual switch 100 is closed, the sequence switch indicated at 113 being in position 1, a circuit isvclosed for connecting relay 114 from battery, lower arm of the manual switch 100, sequence switch contact 115 in position 1, back contact and outer armature of relay 116, relay 114, back contact and left-hand armature of relay 117, to ground. Relay 114C in attracting its armature, connects the brushes 101, 102 and 103 in operative relation with the testing arrangement, and also at its lower armature closes a circuit including the relay 116 to the multiple terminals of the various connector switches which are connected to the/testing ar'ran ement. As soonr asurelay 114 is operate the relay 117-.is' connected-to the brush 103, and to contact 106-and conductor 111 through the brush 118, and, providing the line switch under test is "busy, to ground at the first selector switch with which such line switch is connected. Therefore, the relay 117 will be energized from battery through the lower arm of the manual switch 100, sequence switch contact 115 .(POSitiou 1), relay 117, sequence switch contact 129, brush 103, conductor 111, brush 136, outer armature "of relay 147, which is energized while the selector is in use, to ground. Belay 117 "be-- ing thus energized, establishes a locking circili'tiioiitself at left armature and front contact independent of the circuitreviously traced through the lineswitcli, elay 117 when thus e11cr'gized,-closes'at its rightdian'd ront' contact,'a circuit from batterythrough the power magnet 1130f the sequence switch, right armature and a front contact of-relay. .117, interrupter 119, upper-*armoiE the manuali switch 100, to

ground. The sequence-switch will there upon move underfthe contr'ol of, the interrupte'r 119 into position" "13 and in position ,jgl3,,wil lf close am energizing circuit for the stepping :magnet 120 from batteryzto' the lower-arm of thef ma'nual switch .100,- see switch contact115 1 (position 13-),

stepping magnet 120,- to ground The-auto tithe esting-arrang m nt wi l thereupon be steppedforwardandwill ate-- eague 5 a ofthe manual switch,

- contact sprin sdci-ate the testing arrangement with amother line switch.

If the line switch rs idle will not be energized, and the sequence switch will be moved-directly into position 2 under the influence of the interrupter-119 through the contact spring "121, position 1. Associated with the, testing arrangement is an impulse sending device, comprisin three impulse wheels 122,123 and 124. E ach of these wheels are adapted to send out the same number and combination of impulses but at different s" eeds. For'example, the impulse, wheel 12 may be operated automatically to send a combination-of impulse such, for example, as 3, 5, 2 at the rate o ten impulses er second, while wheels 123 and 124 are ad apted to send out the same combination of impulses at the rate of twelve impulses per second, and eight impulses per second, respectively.- The con tacts in the connector switches which are indicated at 125, 126 and 127, represent in all of the connector switches the number corresponding to the testing arrangement.

As soon as the sequence sw tch reaches position 2, the sequence-switch contacts 128 and 130 being closed ,andthe contact springs 131 operated by-the first impulse wheel 122 being also closed, a circuit is established for the line relay 132 of the line switch, from battery, relay 132, outer left-hand armature and back contact of plunger magnet112, line 108, conductor 107, contact 104, brush 101, armature and contact of relay 114,

r the relay 117 spring 133 a so .in position 2, interrupter springs 131, contact spring 130 infposition .2, contact spring 129 in position 2, armature and contact of relay 114, brush 102, contact 105, conductor 109, branch at line 110, armature and back contact of plunger relay 112, to ground;

'In re'sp'onseto' the energ-ization of..line relay 132, arlrc'uit isielosed for the plunger magnet 112 which may be traced, fronrbattery,

through the left armature: and back contact of the lock relay rso'jthrou'gh the left-hand winding off/lie plunger magnet 1'12, air-mature'nnd treatments of line relay 132 to ground. .The' plunger magnet thereupon 1 operates and brings, tl'iebrushes indicated at 134 135,- 136 and 137 into engagement" .w-ith t e contacts of a trunk leading to a first selector, such contacts being indicated at- 138,- 130,140 and 14.1.

As the present invention isnot concerned: with the. operation -of the master switch, a

which is as'soeia -tedwith a plurality ofthe line switche. the 'o" -er'ation,ofsuch nias'teli described in detail. The i switch will "6 be 128 in position 2, contact trip magnet- 43, the solenoid 142, the lock";

y. he s ar ihsi y l 4gie upe e visorv relay 1 18, tomi II RAK s w -"sn aisseemme 'cally shown on the drawin As soon as a.

* per armature and contact of line'switch has seized an id e trunk leadin to a selector switch, a circuit is establishe "for the line relay 1450f such selector switch from battery through the righhhand winding of' said line re ay, through the upper armature and back contact of relay 146, from thence over one end of the trunk line to terminal 138, brush 134, conductor 108, conductor 107, terminal 104 brush 101, uprelay 114, contact spring, 128 in position 2, contact spring 133'in position 2, normally-closed spring 131,

contact of relaycontact "spring 130 in position 2, contact "spring 129 in position 2, brush ,102, terminal 7 release relay .181 of the selector switchs As the-impulse wheel 122, rotates, the circuit for the. line relay justltraced will be. interrupted three times and the armature of the line relay will close the circuit for the vertical magnet 149 three times from battery, through' the vertical magnet 149, slow-release relay 181, front contact and inner armatureof slow relay 147, lower armature and contact of relay 146,,back contact and armature of line relay 145 to ground.

'and front The slow-release 'relay 181 will be energizedin this circuit in response. tothe first dener'gization of the relay 145. I Thereupon an energizipgci-rcuit 'for the private maghetidlw wlllvibe -established atthearmafront contact of relay l8l,which will be maintained energized until the first series of interruptions has ceased, when in ture an response, to; the long 'energization' of the relay" 145, the relay 181 will be deenergized. However, as relay 150 eloseslat its armature ofstepping magnet 152, through the vertical armature and contact ofzrelay 147, it will rearmature and' back gconta'ctrelay being en i main energized? The r-clay 150, therefore,

established 'for the \3 magnet matureaa'fid back contact. of each 111 back contact of relay152, vertical ofi normal n ngwa outerarmature and-contact of relay 147 to groun z ibreaks itsbu 6,5

amuse L contact, a-loclring'circuitfor itself,

*b'y wayg lof conductor lfi land back contact.

1 ofl' -normfal switch"153,.toground' at the .outer' l' 181: armature and front contact of relay 150, conductor; 151,,.;right-hand armature and.

, tum 2 vengeancer i ward movement of its armature, steps the selector switch brushes 154, and 156 one step in the rotary direction, hunting for an idle trunl. As long as the test brush 154 passes over contacts associated. with trunks leading to a busy connector, the relay 150 will be maintained energized through ground on the test conductors of the busy trunks, and the switch will continue to step. As soon, however, as an idletrunk' is found, the'cnergizing circuit for the private magnet 150 will be interrupted at the right-hand armature of such magnet and therelay 15G. will be cleiinergizetl, and will open the circuit of the rotary magnet 152, stopping the switch. I

Relay 150 being detnergizcd, a circuit established for the relay 146 from battery, through such relay 145, back contact and armature of relay 150, cenductm? 151, back contact and armature of relay 152, vertical off-normal switch 153, to ground at the outer left armature of the relay 147. 'lfhe relay 146 in energizing, extends the connection to line relay 160 of the connector switch. which has been seized. The line relay 160 of the corn nector switch is therefore energized over a circuit. from battery, through upper Winding of relay 160, upper armature and back contact of relay 161, to theterininal 157, and from thence by Way of crushes of the selector switch and line'switch'to the normally closed contact springs 131 of the im- 'p'ulse wheel 122, and back also through the brushes of the line switch and selector switch to the inner lower armature of relay 161 and back contact and lower winding of relay 160 to ground.

Arfi'rst and second set of teeth on the interrupter wheel are spaced apart an: amount suflicient to maintain the contact springs 131 closed during the hunting operation of. the a selector switch. Upon the initial energize- Vtion'pf the line relay 160, the slow-release relayf182 is energized and as the line relay deenergizes in response to the first interruption, a circuit, is closed. from battery, through-theside-switcharm 162-, in position. 1, through the vertical magnet 163, slow-release relay 164, of'slow release relay 161', back contact'and armature of the line relay 160 to ground. In response to the second series'of interruptions, the vertical magnet 163 will be operated' fivetimes and will step of the connector switch to the fifth level of terminals in such a switch. "In response to the long energization of the lincrelay 160, following thesecond series of interruptions, the, relay 164 will release, whereupon: the vcircuit for the energization of privaterelay 165 will be opened, The releaseof the'gprivate magnet 1.6.5 fsteps the sideswitchmto en, in f onse to-thiast e may 160 is again the brushes armature and front contact intermittently energized and deenergized, the relay 182 being thereby energized, a circuit is established to cause the intermittent energization and deenergizatipn of the rotary magnet 183 from battery, through the side-switch arm 162 in position 2, rotary m et 183, outer armature and back conoperates in identically the'samemanner as tan of relay 166, relay 164, right hand ar- .'matureand front contact of relay 182, ar-

mature and back contact of relay 160 to ground.

In response to the intermittent energizetion and deenergization of the rotary magnet 183, the brushes 167, 168 and 169 of the connector switch are brought into contact with the contacts 125, 126 and 127 leading to the testing arrangement.

As the testing arrangement connected to these contacts will always be in condition to be connected to by such brushes, the contacts will test as an idle line and the side switch will be moved to position 3 in a well-known manner. In position 3 of the side switch, a circuit is established for the relay/172 of the testin arrangement from battery, through reFay 172, terminal 127, brush 169, side'switch arm 170 in position B, to ground. The operation of the relay 172 closes the ringing circuit which includes the'relay 116. Also in position" 3 of the side switch, a circuit is established for the ringing relay 171 from battery through the side-switch arm 162 in position 3, right armature and back contact of the ringing cut-off relay 184,- relay 171, interrupter 173 to ground. The intermittent operation'of the relay 171 in this circuit intermittently connects generator leads 174, 17 5, through the brushes 167, 168,,and contacts 125, 126, to the circuit previously traced including the relay 116. The relay 116 is energized in response to this rin ing current and opens at its outer left-han armature and be ck contact a circuit previously traced for the relay 114, which in releasing its armature, opens the ringing circuit.

During the release of relay 1161, the testing arrangement including the impulse wheel is disconnected from the brushes 101, 1 02, 103, and hence the line switch, first selector switch, andconnector switch will all be restored to normal, as the relay 114 releasing,

though the calling subscriber replaces his receiver, The relay 116 when energized, as descri (1 above, also closes at its inner armatur and contact, .a circuit from battery;- througthe power magnet 113 of the sequence witch contact 121 in} position 2, in- *1 ner ari atur'e and contactof relay 1.16 to;

moves in 0 position 3. v

,Relay ground xkwhereupon the sequence switch has an extergizing circuit closed for itself in position; 2 through the sequence switch;

contact 17 but since we will assume that wheels 123 and 124 respectively.

85, similar-to relay 52 ofFig. 1, p

This recordingmagnet as previo scribed is so ad'usted thet' t will only-after apre eter'mined time intefiral so' the connection sat up throu h the line switch, the first 'lector and t e connector rupter 1 9 acting through the contact spring 121 in position 3, the sequence switch moves to position 4. However, as soon as the relay 116 releases, the relay 114 is energized and the testing arrangement operates to test and seize on the line switch again, and under the influence-of the impulse wheel 123, to establish the connection hack to the testing a'rrmlgcment over again. If this con nection is established successfully within the predetermined tiinc, relay 116 is again operated, the line switch selector and connector are restored to normal, and the sequence switch is stepped into position 5 and from thence into position 6.

In position 6 the same operation and test is repeated under the influence of the impulse wheel 124. It will he thus observed in the even positions of the sequence switch, the testing arrangement will seize and test a line switch setting up a connection includin'g'spch lineswitch, and if such connection is established within the predetermined allowablc time, the relay '116 is operated'to step the sequence switch into the next odd position.

This 0 eration'is' again repeated in positions-8, 0 and 12, and the line switch is tested ,under the control of'the impulse In these positions of the sequenceswitch, however, the capacity 186 and the resistance 186 are connected in the impulse circuit. \Vhen this last test is accomplished, and the relay 116 is operated in position-'12, the-sequence switch is driven into position 13in the wellknown manner, In this position'thestep ping magnet 120 energized, and. tie

pose of testing another lin'e'switch. i

I"? the line. switch,"a n'd" 'lcldentallythe selector switcn and; connector switch 'used in connection therewith operate in the standai.-d'nianner in'res'p'onse to all of the tests,

six complete connections will be established, the line-switch being tested at threedifi'erent speeds of impulses under 'two'; different line conditions;

recording magnet is shown-at- 185, which recordingmagnet is-eontrolledby a, sequence switch "contact 176; elosedin the even positions 'of "the sequence 'switch,"ifn

which positions'- the- 'tes'ting reserpine.

.be, opened. in the odd position of vthe se qucncfc swltch before such time has expired.

If on the other hand any singleone of these six test connections is not established within the predetermined allowable time, the recorder magnet185 will-operate and record an unstandard condition.

In addition, the recorder magnet will close atuitsleft hand armature andcontact a circuit for the wipe-out relay 117 from battery to the lower arm of the manual switch 100, sequence switch contact 115, in position 1 to 12, relay 117,'armature and front contact of the recorder magnet 185 to ground.

The operation of. the relay 1-17 under these conditions causes exactly the same result as the operation of such relay when the line switch under test was found to be busy. That is to say, the testing arrangement will be disconnected from the brushes of the automatic switch and such brushes will he stepped into contact with another set of terminals.

What is claimed is: f 1. A testing arrangement for testing the operation of automatic selector switches comprising means for operating such switch to direct the movable contacts thereof to a predetermined set of stationary contacts, a

recording device, a timing device, and means controlled through such contacts to prevent theoperation of recording device.

2. An arrangement for testing automatic selector switches comprising a selector switch, means to send impulses to the operating mechanism thereof, contacts in such switch adapted to be selected by such switch in response to such controlling impulses, a recording device, and means controlled over such contacts for controlling such recording devices 3. A testing arrangement for testing'the operation of automatic selector switches comprising automatic means for sending inipulses to such switch to direct it to aparticular set of contacts, recording mean's, and means for controlling. such recording means rendered operative when such switch makes connection with, such particular set of contacts.

4.. A testing arrangement for testing the operation of automatic selector switches comprising:a-timing device and a recording device controlled thereby, means for starting the switch under test into operation and for simultaneously rendering said timing device operative, and means controlled by the switch in completing its operation to remove the recorder from the control of such timing device, provided the switch completes its operation prior to the completion of the operation of the timing device.

I i i V 5. A testing arrangement -for testing the operation of automatic f selector switches comprising automatic impulse sending means, means for automatically associating such impulse-sending means with the switch to lie testcd, recording means, and means controlled by the operation of such selector switch in response to such impulses to con trol such recording means.

(i. A testing arrangement for-automation selector switches comprising means for-pro ducing a series of impulses, means for associating such impulse-producing means with a switch to be tested, a set of contacts in such switch to which the brushes of such switch are-adapted to be directed in response to such impulses, recording'means, and means controlled over-such set of con-. tacts for controlling such recording means.

7., A testingarrangement I'or testing automatic selector switches comprising means to test'aselector switch to determine if it is idle, means to seize suchselector switch if idle, and prevent its seizure by other switches, means for establishing standard operating conditions in such selector switch, a recording device, and means for controlling such recording device controlled by the operation ofsucli selector switch in response to such standard operating conditions.

'8. A testing arrangement for testing automatic selector switchescomprising means for automatically operating a selector switch under diflerent conditions, recording means, and means controlled by the operation of suchselector switch for controlling such re cording means.

9. A testing arrangement for testing the" operation of automatic selecting switches comprising means for automatically'operating a switch at different speeds, a timing d'evice, and a recording device adapted to be controlled by such timing device, and'means operated if the switch completes it'soper ation within a predetermined time for rem'o 1110 ing such recording device from the cont 1. of such timing device. Q 10. A testing arrangement for an ma connector switches comprising mea establishing standard operating condit ns in a connector switch to connect such nector switch to a particular set "of static ary tern'iinals, a recording device, In ns associated with such connector switch to in press ringing current on such set of term nals, and means responsive to such rin 'ng' current for controlling the operation or the recording device. J'-" 11. A testing arrangement for testing the; operation of a plurality of automatic switches comprising means for establishing? a test connection over such switches, a rIe-E cording device, and means controlled by the establishment of such connection for cont-' 1 trolling such recording device.

16 initiating- 12. A testing arrangement for testing the operation of automatic telephone exchan e systems comprising means for automatically establishing operating conditions normally 5 established by the calling subscriber in in! tinting a call, a recording device, and. means presponsive to the standard operation of the system in establishing a connection for controllin such recording device.

13. i testing arrangement for testing the operation of an automatic telephone exchangesystem comprising means for automatically duplicating the operations normally performed by a calling subscriber in duplicating the operations normally performed y a called subscriber in responding to the automatic establishment of the call a call, means for automatically thus initiated, a recording device, and means controlled by the establishment of the call 20 to control such recording device.

14. A testing arrangement for testing the operation of an automatic line switch com prising means for automatically establishing operating conditions in a i automatic means for successively associatin such first mention-ed means with a plura ity of such switches, a recording device, and means controlled by such switch in its operation for controlling such-recording de- "30 vice.

In witness whereof, I hereunto subscribe my name this 30th day of October A. D. 1916.

HENRY P. CLAUSEN.

ne switch, 25 

